1 / 12

Warmup 10/14/13

Warmup 10/14/13. Tell me a story about something that can soak up water. Objective Tonight’s Homework. To learn how chemicals can absorb and hold water. pp 214: 65, 66 pp 215: 67, 68, 69. Notes on Hydrates. Some chemicals have the ability to soak up and hold water.

gerard
Télécharger la présentation

Warmup 10/14/13

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Warmup 10/14/13 Tell me a story about something that can soak up water Objective Tonight’s Homework To learn how chemicals can absorb and hold water pp 214: 65, 66 pp 215: 67, 68, 69

  2. Notes on Hydrates Some chemicals have the ability to soak up and hold water. The water bonds to the chemical structure of the crystal.

  3. Notes on Hydrates Some chemicals have the ability to soak up and hold water. The water bonds to the chemical structure of the crystal. We call chemicals that can do this hydrates. Hydrates usually contain a specific ratio of water to chemical.

  4. Notes on Hydrates To write a hydrate, we write the chemical name just like regular, but add a dot and the number of water afterwards.

  5. Notes on Hydrates To write a hydrate, we write the chemical name just like regular, but add a dot and the number of water afterwards. Example: This is 1 molecule of copper CuSO4 • 5H2O  sulfate with 5 waters attached to each molecule.

  6. Notes on Hydrates To name hydrates, we say the name of the molecule, and add on the type of hydrate. Molecules of water Name 1 monohydrate 2 dihydrate 3 trihydrate 4 tetrahydrate 5 pentahydrate 6 hexahydrate 7 heptahydrate 8 octahydrate 9 nonahydrate 10 decahydrate

  7. Notes on Hydrates To calculate the number of the hydrate we do the following:

  8. Notes on Hydrates To calculate the number of the hydrate we do the following: - Calculate the mass of the compound with water. - Heat it up to drive off all the water. (We call this anhydrous when it has no water) - Measure the mass again and find the difference.

  9. Notes on Hydrates To calculate the number of the hydrate we do the following: - Calculate the mass of the compound with water. - Heat it up to drive off all the water. (We call this anhydrous when it has no water) - Measure the mass again and find the difference. This difference is the mass of the water. Find the number of the moles of dry material and of the water to find the ratio.

  10. Notes on Hydrates Example: What is the formula for a hydrate that is 86.7% Mo2S5, and 13.3% H2O? Mo2S5 molecular mass = 352.2 g / mol H2O molecular mass = 18 g / mol 86.7 g Mo2S5 * 1 mol = 0.246 mol Mo2S5 1 352.2 g 13.3 g H2O * 1 mol = 0.739 mol H2O 1 18 g Divide both by the lowest. 1 Mo2S5 for 3 H2O. Mo2S5 • 5H2O

  11. Hydrates Demo Let’s see some hydrates in action

  12. Exit Question #23 Name the following hydrate: Mn(NO3)2 • 4H2O a) Manganese (II) Nitrate tetrahydrate b) Magnesium (II) Nitrate tetrahydrate c) Manganese (II) Nitrate quadrahydrate d) Magnesium (II) Nitrate quadrahydrate e) Manganese (II) Nitrate f) Magnesium (II) Nitrate

More Related